IPACS Electronic library

Onboard Alignment Identification of a Space Telescope and a Star Tracker Cluster

Yevgeny Somov, Sergey Butyrin

For high-accuracy pointing an orbital telescope (OT) it is
required that the relative position of reference frames connected with the OT and the star trackers (STs) is precisely determined. The elaborated method for solving this problem is based on onboard processing of the information obtained at scanning the star sky simultaneously by the OT and the STs. We apply the multiply digital filtration of measurement, polynomial approximation and a
vector spline extrapolation of the quaternion values for the OT
and STs attitude. The accuracy estimates obtained at the alignment identification, are presented.